Diesel Combustion Noise Reduction by Controlling Piston Vibration

Event
SAE 2015 World Congress & Exhibition
Authors Abstract
Content
It has been required recently that diesel engines for passenger cars meet various requirements, such as low noise, low fuel consumption, low emissions and high power. The key to improve the noise is to reduce a combustion noise known as “Diesel knock noise”. Conventional approaches to reduce the diesel knock are decreasing combustion excitation force due to pilot/pre fuel injection, adding ribs to engine blocks or improving noise transfer characteristics by using insulation covers. However, these approaches have negative effects, such as deterioration in fuel economy and increase in cost/weight. Therefore, modification of engine structures is required to reduce it.
We analyzed noise transfer paths from a piston, a connecting rod, a crank shaft to an engine block and vibration behavior during engine operation experimentally, and identified that piston resonance was a noise source. In order to absorb resonant energies caused by vertical movement of the piston, we have designed new piston-pin structure integrated with dynamic damper which resonates in the opposite phase to the piston. We verified the diesel knock reduction by using this new technology.
Meta TagsDetails
DOI
https://doi.org/10.4271/2015-01-1667
Pages
7
Citation
Kanda, Y., and Mori, T., "Diesel Combustion Noise Reduction by Controlling Piston Vibration," SAE Int. J. Engines 8(4):1775-1781, 2015, https://doi.org/10.4271/2015-01-1667.
Additional Details
Publisher
Published
Apr 14, 2015
Product Code
2015-01-1667
Content Type
Journal Article
Language
English